A question about HPT and pregnyl

After 1500 iu pregnyl is it a good sign that HPT are getting darker every day post? From what ive read on the net they should get lighter each day as the HCG slowly leaves your system. I know that you cant take a +HPT as a definite for at least a week post pregnyl but Im a POAS and Im testing everyday just to see 2 lines (even if they arnt real) and the lines seems to be getting darker...

Any personal experiences from POAS addicts and Pregnyl?